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沙埋对樟子松幼树生长及光合水分代谢的影响

赵哈林1**,李瑾1,周瑞莲2,曲浩1,云建英1,潘成臣1   

  1. 1中国科学院寒区旱区环境与工程研究所, 兰州 730000; 2鲁东大学生命科学学院, 烟台 264025)
  • 出版日期:2014-11-10 发布日期:2014-11-10

Effects of sand burial on growth and photosynthesis and water metabolism of Pinus sylvestris var. mongolica saplings.

ZHAO Ha-lin1**, LI Jin1, ZHOU Rui-lian2, QU Hao1, YUN Jian-ying1, PAN Cheng-chen1   

  1. (1Cold and Arid Regions Environment and Engineering Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2Faculty of Life Sciences, Ludong University, Yantai 264025, Shandong, China)
  • Online:2014-11-10 Published:2014-11-10

摘要:

为了解沙埋对樟子松幼树生长特性及光合水分代谢的影响,2013年在内蒙古科尔沁沙地研究了不同沙埋深度下3年生樟子松幼树的存活率、株高、地上生物量等生长特性及光合速率、蒸腾速率等光合水分代谢特征的变化。结果表明:樟子松幼树最大可耐受大于株高2 cm的沙埋,沙埋超过该深度其幼树全部死亡;低于株高以上2 cm的沙埋有利于促进樟子松幼树的株高生长,但不利于其地上生物量的积累;低于株高以上2 cm的沙埋可以导致樟子松幼树的光合速率、蒸腾速率、气孔导度、胞间CO2浓度显著增加,但以50%株高沙埋处理的光合速率、蒸腾速率、气孔导度增加幅度最大,胞间CO2浓度以株高以上2 cm沙埋处理的增加幅度最大;沙埋并不造成樟子松幼树的水分胁迫,但随着沙埋深度的增加其水分利用效率趋于下降,并以株高以上2 cm沙埋处理的水分效率最低。樟子松幼树的高生长与其光合速率、蒸腾速率呈显著正相关,光合蒸腾速率与气孔导度、胞间CO2浓度呈显著正相关,水分利用效率与植物含水量、蒸腾速率呈显著正相关,地上生物量与光合效率、蒸腾速率的相关性未达到显著水平。

 

关键词: 群体划分, 鸢乌贼, 头足类, 形态参数, 渔业

Abstract: In order to assess the effects of sand burial on growth properties and photosynthesis and water metabolism of Pinus sylvestris var. mongolica saplings, the survival rate, plant height, aboveground biomass, photosynthetic rate (Pn), transpiration rate (Tr) and water use efficiency (WUE) of 3yearold P. sylvestris var. mongolica saplings with different sand burial depths were measured in the Horqin Sand Land of Inner Mongolia in the spring of 2013. The results showed that the maximum depth of the saplings to withstand sand burial should not exceed 2 cm above the plant height, and all saplings died when the sand burial depth was over 2 cm above the plant height. When the sand burial depth was below 2 cm above the plant height, sand burial promoted the height growth but did not benefit the biomass accumulation of the saplings, and significantly increased Pn, Tr, stomatal conductance (gs), and intercellular CO2 concentration (Ci), with a maximum increase of Pn,Tr, gs, respectively when the sand burial depth was at 50% of the plant height. Ci was the maximum when the sand burial depth was 2 cm above the plant height. Although the sand burial did not result in the decrease of water content in the saplings, WUE of the saplings tended to decline with increase of the sand burial depth, with the lowest WUE when the sand burial depth was 2 cm above the plant height. There was a significant and positive correlation between sapling height and Pn, Tr, between Pn and gs and Ci, and between WUE and plant water content and Tr. The correlation was not significant between the aboveground biomass and Pn and Tr.

Key words: Cephalopod, Sthenoteuthis oualaniensis, morphological indicators, population classification, fishery